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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02d557e2679374fc1bded097cb3b66218854773e8c885d5682c335017803b95' 
  AND token = 'xEyg7NQKZXD+3IAkHvndEJ0eVUvvO7c6uaXJ/l+wgj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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