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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3107ee7a2d05fbb0b7b56460338da252d0d25f0d55b8eca8852984634e5bcfca' 
  AND token = 'PYb2bYrX8Xi8QfHkTEwg9ccl3euiivzcpKbL0T1fBW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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