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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6832f58444f50fbce080917dbaa5eacfe793aca2affea98d6983e6a2b9b88f8' 
  AND token = 'lo6fx6NSVz4/qTKA2QtP+h5Nn1+6o8fxaWAovcJn5Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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