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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01c0eb2478de7bfb0e6affaf844b668e2cd813f427756062e6a3fe32fd37b08' 
  AND token = 'ksnTgUgeay3Yx8T+Uhsi/5WTfzVQ/VoPkmQ+UOhbCYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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