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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07186f5a00f3f61175523017c6b662e08fa73b23894c0c295a68b751e2a657b5' 
  AND token = 'AKfo5ZrrWWkOMheYTdKOAbXhD9hMcfXh3o2W4jsh2UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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