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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bc20a9aab24b976480da7150d984c75e229ba4145f44f5f561efb4f5c1b108' 
  AND token = '0SoHjrNG8SeqMv3ie801rl6F84AlyQ0epD7YiWhJ64g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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