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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e68e93a42009375c892aed747dc6823d224b919422fb003a92b42a0ec6826d' 
  AND token = 'lbZUp9T2Qd3PXCaN7xSJG9j3v98Odhv14GlKEkXa1bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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