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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18cabc8add381963f920324d77b3447ac33f5e671b38a2475662e02efee00f6e' 
  AND token = 'RUkLZxN7P6DICGYb27bbrrCPwVWZoy/1Q3oFEYyLmSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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