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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b39b2b2b39c5ae459ab98a31943270cb926a49088c0a5b59baf820acce61fe2' 
  AND token = 'miZ8zBO8i0Q4rn4LWStJkIuilrHAwX4a4Oj1Tv68e70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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