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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bec7b78b0e175df47dbb02d4fbf4e46611a82a8054606a8eff2a9445eba5e0e' 
  AND token = 'rQTrzzGfLiKFCd92DKUaROoIqn2SCC5kzrI0QXcQ6vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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