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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902b76a5ded7a42034d59c1424750a5f7a59a17326b44ab1e09fdda2c2eac460' 
  AND token = 'WBV0+shLU5GU4JXKwt0C1fLnDSQWAAkoPaIibqK7j/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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