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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eeef600100dac9d5b8d6d570bd3b1cee9245ecc9846effcb021ea71e6cc54d3' 
  AND token = 'kmkjSOdwrvuzdTpjrpe8O92f+o7FEqrlHnAg+BoFUos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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