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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6601ef34e3252dcc5c285e61d2d777ebaf4d2a502a9d3a423a18a167c9703cf' 
  AND token = '3qDH0QiVeyEitZfOHP+Q0js8t5EmJ7AYJDUWj9FaPWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}