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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c89ccf09c6511b0d43e381d4c9a5d6b268fffb63ba07beffc4fb55e2b09ab92' 
  AND token = '7RllL9Cu2VbFJyZ7X/q2E0f9mXiFDcwSJB9f9zdmY5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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