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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a22345a15b4c62a2f846c38e55fa0f32d9df838681a0a5eeb4e1807ee04ea89' 
  AND token = '+6hyDNdEBSZ6e7p9TnrGKCgMaul92lejAUBHWSeNrME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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