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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff447fa7c10237a73c1c9282b17789ae33e1d2ba8b2c3ced78ceb0e868a71cc' 
  AND token = '0hXwyQOw5kqFfVlCVH7dovjKJl/pwruLmRE9RO0yigg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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