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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd37fe91a786d44e99ab950db5a5be6832b1b2984eeed3db8b1a4e8d590548f9' 
  AND token = 'OewfWwZyEKAMCssZ8TboSfLbBfPwPLRMmQL/JCYGShY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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