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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cf7ac7772335ff4e3a2345307d871f33d2937acd4e6e6204334f90cb7b8f3d' 
  AND token = 'qSvvt1dWXocPZQOb0FOqo4PM/k1gWvIkxaqONJkXijA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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