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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ab48353b290c1e50797598536ea50380ed2b0391ae5663c1897714778f6f74' 
  AND token = '5A5jWVeMTcRsWO01DshQJGlj7RohKUwiti5S40jQwnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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