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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2965361e6032b0a0beda197cb505472b6b089e2f8990c78cf75816dedcde9d10' 
  AND token = 'mUZ4YDWkuOIXSd5v/9Qd4u+J3KxTptnDr86LKS6NRs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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