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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76528dddecbf52b0c776799b0314280a475e749bd4f46cabf344b7ec317378a2' 
  AND token = 'kCjxtuNlGU84DI26XA/+j4a3aAPMzmZU3pQ/+m+ULTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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