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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42049ba28eac0ded069ee8188354a9d8c41aa96394519e034084aeebde5bdf2f' 
  AND token = 'wYcMN1yB2wq3/8MnSvpKuArkLkGOV65LuRWRtEgT2VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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