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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc87dc2785c0542f92ad67f8314e881d3ce28445c863863cfd963ec2f7f6a26' 
  AND token = 'YRHpoRMKJq2iE8gRDPmp3SFrmjDtMYKd2Mgm1y4UfA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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