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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2b3a763574e1692695972ecc3a9dd4aba09591d017d9cc0723fe9b0b350233' 
  AND token = 'g1i0XvTcAMC9REMTzZe5UDPDoDd6tETCiZ3baup4y7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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