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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8cb8b63d137e56b2c56097e3ac8adc29c3b401faccfa71cefdf4c6621d90b8c' 
  AND token = 'rFHYeUMGZA3NEjXZqQB9ptRMDVnxxlU16R5DOKRjyAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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