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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30661609984c17de8d025e6d1239a12e19caea888ce623a0edd0c1e83af2fe65' 
  AND token = 'sPM5dOTxeAfGqHu0vbpMAYQzFDPTN6EdxfTTbFqoa/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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