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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735d2362bd16f59c1b929b151efcbdd8bf8f25671a951f75df73bf8dadde433b' 
  AND token = 'MbuYmfxjNHTEkAQLeFwZwNd62aqT/XmM8FILkqxsOIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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