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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bef52354e94fa2f45880cda86d61a0c1438af789f01f18278958b7f948dda8f' 
  AND token = 'cHiHVXjlKELDrRMcE/Hod+ROY0ZhvFRtLC0ri8Ww670=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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