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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54ff48223303067f63e889476827b23b40553255887c2a7cba6e9380bc3618a' 
  AND token = '8BP8DRXjfR98c3DVgBaF0x5ipA8TElpzx2CvkFBRHsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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