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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6ab3420a7eaa7cd67fb3fe2e672088fd6e98f74fae1cb810ce3d61a780c89d' 
  AND token = '3fIR4cfsdeedlBjUlDQRTKSxuDnZm1+bzu5DCcnDH68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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