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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8397cce9f3c13ee1f898e685319ec77e0ee52cd1ffd0904f8cbb981fbf748c07' 
  AND token = '3F1MECcwz/rjf2HqLodieCgcugaSGA0B1SxT+j3/5V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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