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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62f050cb6c22e3a65ad7b14d29cd8f327c57734e3d9cf4b30dffbec6bc73b78' 
  AND token = '0bXnVA2yW0WPzuf9inT7AprxyYoxgONDBxVMNp+iAEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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