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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47b3f2fd6518dd6fda27bea8edf7b1d6b47d3842ab0a6ef3a32e419a0e4f49c' 
  AND token = 'yM+5hqgMwTshI8ylGOA8awTWrYosKeobXRo2MX50zSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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