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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812a6814684b72a083f76f8953f124bef5fcdca2072a4a5f5a8c714bff57c012' 
  AND token = 'j2BLkeH5Q/MumF7w5vHMm01eImkDRUAcW3apcWDgXhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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