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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1656480ed97afb6dfd5a814950303836005f78de41e1acb31092f0d47a5ab89' 
  AND token = 'tksSj1DQ/AX0MIGv6+GqmBv4NosVDkdamdEEh+CJMiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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