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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f12ea677be4f14e03a206f40eae2d5ef265501c85dde689462a00d97d90dfdc' 
  AND token = 'iFl/fqI+K2FqEcp60rDEAa01kh0ij/RzvPHdE7qI/K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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