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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b208795753b6039f485768a9da9390644e75c31c68e1be4bfbc5a05733f8a2a4' 
  AND token = '1+kVP63pR9mcUsEv7krwv0L54rESVi83y5b/4w1tZSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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