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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c229d102a5f0a859718d9e7368a57f7d1fad6a2e0c70e59c24c383ea7978e3a1' 
  AND token = '4N1wCgccRUjjk0zg4hkFXj7ME83wLh6uJPe1ufGmc58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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