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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df97bc60ab2d5e7430e7882273032f2f0ec011aa1944fbcfab91d6bb5fd952e' 
  AND token = 'YPHejTqwH+sZhAfailN/wL7GSoGO6t/0xt080S6IJYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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