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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60a91eb95d97c368bf90660c816de6d84791043cc93f3a1d3555845faaffb85' 
  AND token = 'ukoSveYhvH0gMJR+VCqJgDl6ymtzA/DZJsTNRcEogEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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