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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2495e721457d18ac191dd87e9b38b8e7604e8f81b8ca39cafd089e9421f9706' 
  AND token = 'L580JUNO37BRWulBzSdCNfp530+R9Tpi/K5l57z7Ho8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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