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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676b73f6403e3394e35e086e6abea2a9c09cba26cd0086bd9876b4bcff1745f1' 
  AND token = 'IlCCc7Ft0u6mx7SYGdP61C6po16wbT3noCvz9/W87qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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