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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3e2aeb66648255c65a1010e34bd5e6bd7b685d59e4ab649706d1da5b3fe7c7' 
  AND token = 'ch7JYGlrkeIBHp7s/aewaYbO4hqcbUibInOv3EimKIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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