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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31231d7fc8378a903e3417a5d66ea5913f8a300510f79af34f9e5af02a5d908' 
  AND token = 'V5f6WDnKlt1jPB8qamd3xinR4IS4DCdjezPOOX4YbRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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