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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4fa0929c7782eef8eee8e9f3098fbcddff22c2d4036c924bb6b5e4c069cd55f' 
  AND token = 'VkHwzCdT2XEW7MX0Y1XMySIh495EgwPue8gjAFRBOts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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