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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a898529379a563ed5c15458b1183d768f1232df6a4038c8e2c81b23a5ec9e36' 
  AND token = 'o65u7EB72f8qn6A7JbmC0oiUCi6bkl0aV10hvI+zlrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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