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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9481396bf29a297ade71c90278afb12685d80e2bfbc81b8df40e19745316710e' 
  AND token = '6FpGYTHNlyyL2Gg9rbn/+AgvAnIEGMcmA8rMG6+POyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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