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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ad64dea3c3d249819aa16f2c83b0e9b755cedda31e3c21a673c26de7115ac2' 
  AND token = 'OryFYwdHTng5ZkpP7gBn+Ks5jSaMXpQjk17HGQK4beU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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