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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a7b757c4ea35aa5db0156bb1c05858acd50b6065f208d756bd2d18d8ef8eef' 
  AND token = '4cAY4v5I6ok5z6DCBcYmqYf7WUgcnBT9r/QOQjouvYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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