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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6140e9d0948086fc4718768f56db4571e372a16bc275716e951da956d03d6e9' 
  AND token = 't3G8vCIK5f47yWhBlh7q3LNaKNDFP3i923w2+rbJI1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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