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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea3fcf7fc59ce6b5c3c98a7344c6b1e70008b6b6bba9dd7701978df8b7434f5' 
  AND token = 'bh7kG9JwXYruoIPdYtf+cvLA8oFhzQajDme/hbcagdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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