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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cb3ce1c2d5d9b585dca63a9a8067987a623191ae937c65487a991d8511bb11' 
  AND token = 'Wq5uVfQTaHgYCyJxa6hmwgOUS9/ubBhXdD5D72Ap5Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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