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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3edd281b7c8dd137ac76e5c3990c5044fd43cedb6f9ce5c83af1182387d630' 
  AND token = 'oMaF5UT0as1Gjqxa3Ir2nHECd3e0u9/hz/ngglFtWXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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