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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ca1f5b717cc5b9d31d66088e57b21180e8850b96c68d6b4e5920105d63f88a' 
  AND token = 'rMvacVeOicqmh4dg6T0RE5MhfV237OcCLtAxv579Ij4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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