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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60adfefcf71d1638f43f069ca6aa57907061cb94e3b57458a963dd9a4e3ef352' 
  AND token = 'rztL38HDrPgKpOONK6ZhA7QXREl/J8KgDZ81WRR/59c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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